//
//  UIView+MUAdd.m
//  MetaphysicsOC
//
//  Created by 严贵敏 on 2018/7/27.
//  Copyright © 2018年 严贵敏. All rights reserved.
//

#import "UIView+MUAdd.h"

@implementation UIView (MUAdd)
-(UIViewController *)viewController{
    UIResponder *nexRes=[self nextResponder];
    do {
        //判读当前的响应者是否UIViewController
        if ([nexRes isKindOfClass:[UIViewController class]]) {
            //是否直接处理
            return  (UIViewController*)nexRes;
        }else{
            //否则继续寻找
            nexRes=[nexRes nextResponder];
        }
    } while (nexRes!=nil);
    
    return nil;
}

- (void)removeAllSubviews {
    for (UIView *view in self.subviews) {
        [view removeFromSuperview];
    }
    return;
}

- (UIImage *)snapshotImage
{
    UIGraphicsBeginImageContextWithOptions(self.frame.size, NO, [UIScreen mainScreen].scale);
    [self.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return snapshotImage;
}

/**
 针对有用过OpenGL渲染过的视图截图
 
 @return 截取的图片
 */
- (UIImage *)openglSnapshotImage
{
    CGSize size = self.bounds.size;
    UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
    CGRect rect = self.frame;
    [self drawViewHierarchyInRect:rect afterScreenUpdates:YES];
    UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return snapshotImage;
}
/**
 截图
 以UIView 的形式返回(_UIReplicantView)
 
 @return 截取出来的图片转换的视图
 */
- (UIView *)snapshotView
{
    UIView *snapView = [self snapshotViewAfterScreenUpdates:YES];
    return snapView;
}


/*
- (UIImage *)imageForWebView
{
    // 1.获取WebView的宽高
    CGSize boundsSize = self.bounds.size;
    CGFloat boundsWidth = boundsSize.width;
    CGFloat boundsHeight = boundsSize.height;
    
    // 2.获取contentSize
    CGSize contentSize = self.scrollView.contentSize;
    CGFloat contentHeight = contentSize.height;
    // 3.保存原始偏移量，便于截图后复位
    CGPoint offset = self.scrollView.contentOffset;
    // 4.设置最初的偏移量为(0,0);
    [self.scrollView setContentOffset:CGPointMake(0, 0)];
    
    NSMutableArray *images = [NSMutableArray array];
    while (contentHeight > 0) {
        // 5.获取CGContext 5.获取CGContext
        UIGraphicsBeginImageContextWithOptions(boundsSize, NO, 0.0);
        CGContextRef ctx = UIGraphicsGetCurrentContext();
        // 6.渲染要截取的区域
        [self.layer renderInContext:ctx];
        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        // 7.截取的图片保存起来
        [images addObject:image];
        
        CGFloat offsetY = self.scrollView.contentOffset.y;
        [self.scrollView setContentOffset:CGPointMake(0, offsetY + boundsHeight)];
        contentHeight -= boundsHeight;
    }
    // 8 webView 恢复到之前的显示区域
    [self.scrollView setContentOffset:offset];
    CGFloat scale = [UIScreen mainScreen].scale;
    CGSize imageSize = CGSizeMake(contentSize.width * scale,
                                  contentSize.height * scale);
    // 9.根据设备的分辨率重新绘制、拼接成完整清晰图片
    UIGraphicsBeginImageContext(imageSize);
    [images enumerateObjectsUsingBlock:^(UIImage *image, NSUInteger idx, BOOL *stop) {
        [image drawInRect:CGRectMake(0,scale * boundsHeight * idx,scale * boundsWidth,scale * boundsHeight)];
    }];
    UIImage *fullImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return fullImage;
}
*/
@end
